Voluntary is a word commonly used to describe something that is done willingly or without force. However, there are several synonyms that can be used in place of voluntary, depending on the context. For instance, the word "uncompelled" can be used to describe something that is done without pressure or influence. "Freely" is another word that can be used to describe voluntary actions, as it communicates a sense of independence and choice. Other synonyms for voluntary include "self-imposed," "elective," and "optional." All of these words can be used to describe actions taken without coercion or obligation.